ÑÐÀÆÀÒÜÑß Ñ ÂÅÒÐßÍÛÌÈ ÌÅËÜÍÈÖÀÌÈ
[srazhattsa s vetr'anymi m'el'nitsarni]
To fight against the windmills.
To waste energy in combating imaginary evils or difficulties; to attack an imaginary foe.
Cf. To tilt at windmills.